Assessment Of Urban Ecosystem Health

Urban ecosystem health assessment is adapted to the needs of urban sustainable development.The health of urban ecosystem is the necessary condition for the survival and development of human beings.It is a major issue related to the future and destiny of human beings to maintain the ecosystem health and promote the virtuous circle of ecosystem.Tianshui city to maintain ecosystem health is of great significance to the realization of eco city construction Build a city ecosystem health evaluation system,and makes a comprehensive evaluation on the health status of Tianshui city ecological system,to promote the construction of ecological city Tianshui and harmony between human and nature and to realize the sustainable development of economy and society has an important meaning.Based on the composition,structure and function of the ecological city,combining with the characteristics of city ecological system,on the basis of city ecology,ecological economics and other related theories,selecting 20 indexes,taking Tianshui as an example,discusses the connotation of ecosystem health and the evaluation method based on pressure state response(PSR)the model of the city ecosystem health index system.Application of information entropy reflects the avail value of data to calculate the index weight coefficient,to establish a comprehensive evaluation model of entropy,Tianshui city ecosystem health were evaluated According to the results of evaluation and the characteristics of grey theory,the grey prediction model of GM(1,1)was established to predict the ecosystem health of Tianshui.The results showed that: in the period from 2009 to 2014,the ecosystem health degree of Tianshui city was on the rise.During the period from 2015 to 2019,the comprehensive evaluation value of Tianshui city ecosystem health will maintain a good development trend with the growth rate of e^0.0997.In addition,the establishment of a comprehensive evaluation of entropy based GM(1,1)grey prediction model to evaluate the city ecosystem health,can obtain more objective and comprehensive evaluation results,and analyzed the reason of the change of urban ecosystem health in Tianshui City,puts forward corresponding measures and suggestions,provide a reference to the development of Tianshui city.The main contents of this paper are as follows:The first part,introduction.This paper mainly introduces the research background and necessity of urban ecosystem health,and then determines the research content and technical route of this paper.The second part is about the theory of urban ecosystem and its health evaluation.This paper mainly introduces the concept and characteristics of urban ecosystem,and reviews the current situation of urban ecosystem health assessment at home and abroad.The third part,through the theory and the research status at home and abroad combined with the characteristics of Tianshui itself,determines the evaluation index system of urban ecosystem in Tianshui.Using entropy method and grey theory prediction model to determine the index weight and the prediction of the future urban ecosystem health.The fourth part is the evaluation of urban ecosystem health in Tianshui.Is the focus of the article,describe the research area of social and economic development and ecological environment situation,according to the basic data acquisition and consolidation of the grey theory model of city ecosystem health in Tianshui from 2015 to 2019 five years of time series dynamic evaluation and prediction.Based on the results of evaluation and prediction,this paper analyzes the factors that affect the ecosystem health and puts forward the corresponding countermeasures.The fifth part is the conclusion.The conclusion of the research is pointed out,and the further research direction is put forward.